﻿<p>An <em>IfcSweptAreaSolid</em> represents the 3D shape by a sweeping representation scheme allowing a two dimensional planar cross section to sweep through space.</p>
<p>The swept area is defined by a cross section, represented by a subtype if <em>IfcProfileDef</em>, that is provided as a closed two-dimensional boundary on an implicit plane. The swept area is defined in the xy plane of the object coordinate system. The sweeping operation is applied to the swept area as defined within the subtypes of <em>IfcSweptAreaSolid</em>, some subtypes require an implicit transformation of the swept area to the start position of the sweep.</p>
<p> The optional <em>Positio</em>n coordinate system allows for re-positioning the resulting swept solid relative to the object coordinate system.</p>
<blockquote class="extDef">NOTE&nbsp; Definition according to ISO/CD 10303-42:1992<br>
The swept area solid entity collects the entities which are defined procedurally by sweeping action on planar bounded
surfaces. The position is space of the swept solid will be dependent upon the position of the swept area. The swept
area will be a face of the resulting swept area solid, except for the case of a revolved area solid with angle equal to
2&pi; (or 360 degrees).</blockquote>
<blockquote class="note">NOTE&nbsp; Entity adapted from <strong>swept_area_solid</strong> defined in ISO
10303-42.</blockquote>
<blockquote class="history">HISTORY&nbsp; New entity in IFC1.5</blockquote>
<blockquote class="change-ifc2x4">IFC4 CHANGE&nbsp; The attribute <em>Position</em> has been changed to OPTIONAL with upward compatibility for file-based exchange.</blockquote>